Dressing roll



April 3, 1934. H H W 1,953,146

DRESS ING ROLL Filed Feb. 27, 1953 Patented Apr. 3, I934 PATENT orries 7DRESSING ROLL Henry H. Wood, Canton, Ohio, assignor to The Timken RollerBearing Company, Canton, Ohio, a corporation of Ohio ApplicationFebruary 27, 1933, Serial No. 658,788

3 Claims.

U My invention relates to the dressing and redressing of necked rollsthat are mounted in taper roller bearings, especially rolls of the kindused in metal rolling mills and in paper and rubber making machines. Itis very important that the surface of such a roll shall be exactlyconcentric with the axis of rotation thereof; and heretofore it has beenquite difiicult and expensive to redress such a roll and preserve thenecessary concentricity of its surface with its axis of rotation.Heretofore it has been the practice to entirely dismount such roll, freeit from its bearings, mount its necks on the centers of the dressingmachine, dress or grind the necks, then mount the necks in plain orsleeve bearings mounted on the bed plate of the dressing machine so thatthe roll centers are in line with the centers of the machine, connectthe wabbler on one roll neck with the headstock and grind the roll body.In order to insure accurate finishing by this process, it is necessarythat the roll centers be accurate, that the necks be dressed or groundto the same diameter and that the plain bearings fit accurately on theroll necks. In the event of uneven or very great wear of the roll necks,the use of specially bored plain bearings becomes necessary. The objectof the present invention is to obviate these and other difiicultiesincident to this old process, to eliminate the necessity of removing thebearings during the roll dressing operation and to improve the finishand concentricity of the roll. The invention consists principally indressing and redressing the roll While it is mounted in its taper rollerbearings which are first tightened up to accurately center the roll andeliminate all looseness and play thereof during the operation ofdressing.

In the accompanying drawing, wherein like reference characters indicatelike parts wherever they occur,

Fig. 1 is a longitudinal sectional View of a roll neck bearingarrangement typical of those adapted for the practice of my invention,

Fig. 2 is an end elevation, with portions broken away to show theconstruction more clearly,

Fig. 3 is an elevation of a roll mounted in a dressing machine,

Fig. 4 is an end elevation of the roll in said machine, the holdingmeans for one end of the roll being omitted, and

Fig. 5 is a detail view showing a common type of adjustment shim forsuch a construction.

In the typical bearing arrangement illustrated in the drawing, the roll1 has reduced neck portions 2 on which are mounted taper roller bearingsB, said bearings being received in housings 3. The constructionillustrated includes an abutment ring mounted against a shoulder 5 atthe inner end of each neck 2, a double cone 6 W or inner bearing membermounted against said ring 4, a second double cone '7 disposed outwardlyof said first cone and separated therefrom by a spacer ring 8, bothcones 6 and 7 preferably having a tight press or shrink fit on saidneck, annular series of conical rollers 9 on the two raceways of eachbearing cone, a single cup 10 or outer bearing member for the innermostseries of rollers mounted against a shoulder 11 in said housing, adouble cup 12 or outer bearing member for the two middle series ofrollers 9 and a single cup 13 or outer bearing member for the outermostseries of rollers 9. An end closure ring 14 secured to the housing 3 asby bolts 15 has an inwardly projecting flange 16 abutting against theoutermost bearing cup 13. Interposed between the end of the housing andsaid end closure ring 14 is a two part spacer ring 17 having slots 18around its inner periphery to fit over the securing bolts 15. Theadjustment of the bearings is accomplished by using spacer rings 1'7 ofdifferent thicknesses. The projecting end portions 19 of the roll neckare formed for 00- operation with suitable drive means.

When it is desired to redress a roll, it is removed from the frame ofthe mill or machine, along with its taper roller bearings, and togetherthey are transferred to the dressing machine. In service, it is thepractice to so adjust taper roller bearings as to afford slight play orlooseness in order to make the bearings run more easily and avoidheating. Such slight play is permissible in service because the sheetmaterial passing between the rolls exerts a constant outward pressure orreaction against the rolls which pressure causes the pair of rolls tomaintain a uniform spacing between them. On the other hand, such play isnot permissible when the roll is in the dressing machine without theradial outward pressure arising from. the reaction of the sheet.Accordingly, the taper roller bearings are tightened up before the rollis dressed; that is, the inner and outer raceway members are movedlongitudinally towards each other to completely take up the looseness ofthe intervening rollers relative to said raceways. While this tighteningadjust-ment is effected by relative longitudinal movement of the innerand outer raceways, it not only has the effect of holding the rollersagainst play endwise' but it also accurately centers all parts of thebearing relative to one another and holds them firmly against radialdisplacement. While the roll and its bearings are thus assembled, itsbearings are mounted in any suitable dressing machine, such, forinstance, as an ordinary grinding machine, and ground or dressed in theusual way.

It is noted that, by reason of the tight adjustment of its taper rollerbearings, the roll is precisely centered on the axis of the bearing andmaintains this position throughout the dressing operation; and thereforethe surface of the dressed roll has precise concentricity with the axison which it rotates in service.

The housing 3 illustrated is of rectangular section and the bottom ofeach housing may rest on a suitable work support 20 on the dressingmachine. By means of plates 21 extending over the top of each housing 3and bolts 22 having their lower ends fitted in T-slots 23 in the worksupport 20, the roll may be firmly held in proper position on the worksupports, centered in the grinding or dressing machine. One end 19 ofthe roll may be connected by means of a suitable coupling 24, indicateddiagrammatically, with the head or drive portion 25 of the grindingmachine.

Obviously, numerous changes may be made in the construction of thedressing or grinding machine and the bearing supporting means withoutdeparting from my invention; and the bearing arrangement shown is onlyillustrative; and I do not wish to be limited to the preciseconstruction shown.

What I claim is:

1. The process of dressing rolls that are equipped with taper rollerbearings, which comprises tightening the adjustment of its bearings intheir housings, mounting said housings in holding devices of a dressingmachine and then dressing the surface of the roll mounted in suchtightly adjusted bearings.

2. The process of dressing rolls that are equipped with taper rollerbearings which comprises tightening the adjustment of its bearings insitu, removing the roll from its mounting without disturbing theadjustment of said bearings, mounting said bearings in holding devicesof a dressing machine and then dressing the surface of the roll mountedin such tightly adjusted bearmgs.

3. The process of dressing rolls that are equipped with taper rollerbearings which com: prises tightening the adjustment of its bearings intheir housings, removing the roll from its mounting without disturbingthe adjustment of said bearings, mounting said housings in holdingdevices of a dressing machine and then dressing the surface of the rollmounted in such tightly adjusted bearings.

HENRY H. WOOD.

